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Information by Segment - Summary of Geographic Disclosure (Detail) - MXN ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of geographical areas [line items]    
Total Non Current Assets $ 464,468 $ 398,774
Mexico and Central America [member]    
Disclosure of geographical areas [line items]    
Total Non Current Assets 244,199 195,310
South America [member]    
Disclosure of geographical areas [line items]    
Total Non Current Assets 136,480 120,003
Europe [member]    
Disclosure of geographical areas [line items]    
Total Non Current Assets $ 83,789 $ 83,461